I distinctly remember the 2008 crash, because it was my first year working at a financial firm. I remember the groan that went up after every closing bell when we - and we were just the support staff - realized how much the market fell.
I was particularly excited by the prospect that they would throw the "circuit breaker," which happens when trading is halted because too much money has been lost. I find the idea very comforting. The market can't lose 30% in a day. Sure, it can lose 6% a day for six days in a row, and then we're all screwed, but not all in one day.
Since 2008 they have changed the circuit-breaker rules. Now, If the S&P loses 7%, trading halts for fifteen minutes.
So I have decided (and this is just for me, this isn't advice) that I am going to stop looking at the lower right corner of any news channel on volatile days. Dow drops 1,000 points? Don't care. Wake me up when the S&P drops 150. Anything else I'm just going to write off as political instability leaking into the market.